Are those basically fountain-pen-ink rapidographs? I don't follow drafting pens all that much. Looks like a nice set, regardless!
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Kind of, yes. They came before the Rapidographs, and I prefer them a lot, because they're more maintainable.
Interesting. Not really familiar with this style of pen. Definitely see where reservoir refillable pens with a range of tips sizes is really great for artists and engineers.
They're lovely to work with if you want clear, repeatable lines. You need to maintain a relatively vertical pen position, but the result is perfect.
Here is an example showing two different line widths. You'll see that I messed up a bit and smeared some green ink...

Very nice... Don't think I could attain that level of consistency and precision without using a computer or a stencil. :)




